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Workaround raw string literal bug in VS2017

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This commit is contained in:
Martin Hořeňovský 2017-08-26 15:14:27 +02:00
parent 67dc654c70
commit e8d3be3621
4 changed files with 47 additions and 8 deletions
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4
docs/configuration.md
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@ -72,6 +72,7 @@ This can be useful on certain platforms that do not provide the standard iostrea
CATCH_CONFIG_DISABLE_MATCHERS // Do not compile Matchers in this compilation unit
CATCH_CONFIG_POSIX_SIGNALS // Enable handling POSIX signals
CATCH_CONFIG_WINDOWS_CRTDBG // Enable leak checking using Windows's CRT Debug Heap
CATCH_CONFIG_DISABLE_STRINGIFICATION // Disable stringifying the original expression
Currently Catch enables `CATCH_CONFIG_WINDOWS_SEH` only when compiled with MSVC, because some versions of MinGW do not have the necessary Win32 API support.
@ -88,12 +89,13 @@ Defining this flag speeds up compilation of test files by ~20%, by making 2 chan
`CATCH_CONFIG_FAST_COMPILE` has to be either defined, or not defined, in all translation units that are linked into single test binary, or the behaviour of setting `-b` flag and throwing unexpected exceptions will be unpredictable.
## `CATCH_CONFIG_DISABLE_MATCHERS`
When `CATCH_CONFIG_DISABLE_MATCHERS` is defined, all mentions of Catch's Matchers are ifdef-ed away from the translation unit. Doing so will speed up compilation of that TU.
_Note: If you define `CATCH_CONFIG_DISABLE_MATCHERS` in the same file as Catch's main is implemented, your test executable will fail to link if you use Matchers anywhere._
## `CATCH_CONFIG_DISABLE_STRINGIFICATION`
This toggle enables a workaround for VS 2017 bug. For details see [known limitations](limitations.md#Visual Studio 2017 -- raw string literal in assert fails to compile)
# Windows header clutter

32
docs/limitations.md
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@ -65,6 +65,38 @@ Both of these solutions have their problems, but should let you wring parallelis
## 3rd party bugs
This section outlines known bugs in 3rd party components (this means compilers, standard libraries, standard runtimes).
### Visual Studio 2017 -- raw string literal in assert fails to compile
There is a known bug in Visual Studio 2017 (VC 15), that causes compilation error when preprocessor attempts to stringize a raw string literal (`#` preprocessor is applied to it). This snippet is sufficient to trigger the compilation error:
```cpp
#define CATCH_CONFIG_MAIN
#include "catch.hpp"
TEST_CASE("test") {
CHECK(std::string(R"("\)") == "\"\\");
}
```
Catch provides a workaround, it is possible to disable stringification of original expressions by defining `CATCH_CONFIG_DISABLE_STRINGIFICATION`:
```cpp
#define CATCH_CONFIG_FAST_COMPILE
#define CATCH_CONFIG_DISABLE_STRINGIFICATION
#include "catch.hpp"
TEST_CASE("test") {
CHECK(std::string(R"("\)") == "\"\\");
}
```
_Do note that this changes the output somewhat_
```
catchwork\test1.cpp(6):
PASSED:
CHECK( Disabled by CATCH_CONFIG_DISABLE_STRINGIFICATION )
with expansion:
""\" == ""\"
```
### Visual Studio 2013 -- do-while loop withing range based for fails to compile (C2059)
There is a known bug in Visual Studio 2013 (VC 12), that causes compilation error if range based for is followed by an assertion macro, without enclosing the block in braces. This snippet is sufficient to trigger the error
```cpp

15
include/internal/catch_capture.hpp
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@ -12,6 +12,11 @@
#include "catch_message.h"
#include "catch_interfaces_capture.h"
#if !defined(CATCH_CONFIG_DISABLE_STRINGIFICATION)
#define CATCH_INTERNAL_STRINGIFY(...) #__VA_ARGS__
#else
#define CATCH_INTERNAL_STRINGIFY(...) "Disabled by CATCH_CONFIG_DISABLE_STRINGIFICATION"
#endif
#if defined(CATCH_CONFIG_FAST_COMPILE)
///////////////////////////////////////////////////////////////////////////////
@ -50,7 +55,7 @@
///////////////////////////////////////////////////////////////////////////////
#define INTERNAL_CATCH_TEST( macroName, resultDisposition, ... ) \
do { \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, #__VA_ARGS__, resultDisposition ); \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, CATCH_INTERNAL_STRINGIFY(__VA_ARGS__), resultDisposition ); \
INTERNAL_CATCH_TRY( catchAssertionHandler ) { \
CATCH_INTERNAL_SUPPRESS_PARENTHESES_WARNINGS \
catchAssertionHandler.handle( Catch::Decomposer() <= __VA_ARGS__ ); \
@ -73,7 +78,7 @@
///////////////////////////////////////////////////////////////////////////////
#define INTERNAL_CATCH_NO_THROW( macroName, resultDisposition, ... ) \
do { \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, #__VA_ARGS__, resultDisposition ); \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, CATCH_INTERNAL_STRINGIFY(__VA_ARGS__), resultDisposition ); \
try { \
static_cast<void>(__VA_ARGS__); \
catchAssertionHandler.handle( Catch::ResultWas::Ok ); \
@ -87,7 +92,7 @@
///////////////////////////////////////////////////////////////////////////////
#define INTERNAL_CATCH_THROWS( macroName, resultDisposition, ... ) \
do { \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, #__VA_ARGS__, resultDisposition); \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, CATCH_INTERNAL_STRINGIFY(__VA_ARGS__), resultDisposition); \
if( catchAssertionHandler.allowThrows() ) \
try { \
static_cast<void>(__VA_ARGS__); \
@ -104,7 +109,7 @@
///////////////////////////////////////////////////////////////////////////////
#define INTERNAL_CATCH_THROWS_AS( macroName, exceptionType, resultDisposition, expr ) \
do { \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, #expr ", " #exceptionType, resultDisposition ); \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, CATCH_INTERNAL_STRINGIFY(expr) ", " CATCH_INTERNAL_STRINGIFY(exceptionType), resultDisposition ); \
if( catchAssertionHandler.allowThrows() ) \
try { \
static_cast<void>(expr); \
@ -138,7 +143,7 @@
// Although this is matcher-based, it can be used with just a string
#define INTERNAL_CATCH_THROWS_STR_MATCHES( macroName, resultDisposition, matcher, ... ) \
do { \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, #__VA_ARGS__ ", " #matcher, resultDisposition ); \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, CATCH_INTERNAL_STRINGIFY(__VA_ARGS__) ", " CATCH_INTERNAL_STRINGIFY(matcher), resultDisposition ); \
if( catchAssertionHandler.allowThrows() ) \
try { \
static_cast<void>(__VA_ARGS__); \

4
include/internal/catch_capture_matchers.h
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@ -57,7 +57,7 @@ namespace Catch {
///////////////////////////////////////////////////////////////////////////////
#define INTERNAL_CHECK_THAT( macroName, matcher, resultDisposition, arg ) \
do { \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, #arg ", " #matcher, resultDisposition ); \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, CATCH_INTERNAL_STRINGIFY(arg) ", " CATCH_INTERNAL_STRINGIFY(matcher), resultDisposition ); \
INTERNAL_CATCH_TRY( catchAssertionHandler ) { \
catchAssertionHandler.handle( Catch::makeMatchExpr( arg, matcher, #matcher ) ); \
} INTERNAL_CATCH_CATCH( catchAssertionHandler ) \
@ -68,7 +68,7 @@ namespace Catch {
///////////////////////////////////////////////////////////////////////////////
#define INTERNAL_CATCH_THROWS_MATCHES( macroName, exceptionType, resultDisposition, matcher, ... ) \
do { \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, #__VA_ARGS__ ", " #exceptionType ", " #matcher, resultDisposition ); \
Catch::AssertionHandler catchAssertionHandler( macroName, CATCH_INTERNAL_LINEINFO, CATCH_INTERNAL_STRINGIFY(__VA_ARGS__) ", " CATCH_INTERNAL_STRINGIFY(exceptionType) ", " CATCH_INTERNAL_STRINGIFY(matcher), resultDisposition ); \
if( catchAssertionHandler.allowThrows() ) \
try { \
static_cast<void>(__VA_ARGS__ ); \