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| ID | Project | Category | View Status | Date Submitted | Last Update | ||||
| 0008758 | CMake | CMake | public | 2009-03-18 10:19 | 2016-06-10 14:30 | ||||
| Reporter | Denis Scherbakov | ||||||||
| Assigned To | Bill Hoffman | ||||||||
| Priority | normal | Severity | minor | Reproducibility | always | ||||
| Status | closed | Resolution | moved | ||||||
| Platform | OS | OS Version | |||||||
| Product Version | CMake-2-6 | ||||||||
| Target Version | Fixed in Version | ||||||||
| Summary | 0008758: CheckSymbolExists does not find a symbol although it exists | ||||||||
| Description | There is a symbol (#define) in math.h called fpclassify(x) which returns type of a floating point variable. CheckSymbolExists does not find it. INCLUDE(CheckSymbolExists) CHECK_SYMBOL_EXISTS(fpclassify math.h HAVE_FPCLASSIFY) Below is a code which compiles /* */ #include <math.h> void cmakeRequireSymbol(int dummy,...){(void)dummy;} int main() { #ifndef fpclassify // cmakeRequireSymbol(0,&fpclassify); #endif #ifndef fpclassify fpclassify_function_does_not_exist(); #else puts("Exists."); #endif return 0; } | ||||||||
| Additional Information | CMake 2.6.3 Gentoo Linux Linux Kernel 2.6.28.x | ||||||||
| Tags | No tags attached. | ||||||||
| Attached Files |  CMakeLists.txt [^] (330 bytes) 2009-03-18 10:19 [Show Content]
 math.h [^] (15,728 bytes) 2009-03-23 05:10 | ||||||||
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(0015722) Denis Scherbakov (reporter) 2009-03-18 10:47 |
Here is unmodified code from /usr/share/cmake/Modules/CheckSymbolExists.cmake which CMake saves as a "CheckSymbolExists.c" file and tries to compile. /* */ #include <math.h> void cmakeRequireSymbol(int dummy,...){(void)dummy;} int main() { #ifndef fpclassify cmakeRequireSymbol(0,&fpclassify); #endif return 0; } |
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(0015723) Denis Scherbakov (reporter) 2009-03-18 10:55 |
Originally I found the error on GCC 4.1, but 3.3 and 4.3 also fail. Quick fix: everywhere in CheckSymbolExists.cmake replace CheckSymbolExists.c with CheckSymbolExists.cpp. I don't know what is the difference, GCC manual says that C and CPP are both preprocessed, but this fix worked for me. Denis |
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(0015753) Bill Hoffman (manager) 2009-03-22 22:04 |
.c is a C program and .cpp is a c++ program. So, I am guessing the symbol is not available in C? |
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(0015756) Denis Scherbakov (reporter) 2009-03-23 05:11 |
I uploaded math.h from my linux box, where I see this problem.So far I understand it there is no dependency on C++ anywhere in this file except in one structure. |
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(0016195) Denis Scherbakov (reporter) 2009-04-27 13:02 |
I also wanted to note that some symbols are defined in C, but not defined in C++. On HP-UX on IA64 I've seen: #if defined(_PA_RISC) || !defined(__cplusplus) #define fpclassify(x) _FPCLASSIFY(x) #endif So it is reasonable to add additional parameter to CHECK_SYMBOL_EXISTS, which defines a language to use (C or C++). |
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(0019280) Mateusz Loskot (reporter) 2010-01-22 18:48 |
Recently, I started thread on the list directly related to this issue: [CMake] Checking function or symbol in namespace http://www.cmake.org/pipermail/cmake/2010-January/034718.html [^] Responses are very informative. Hopefully it will clarify the problem a bit. |
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(0041517) Kitware Robot (administrator) 2016-06-10 14:27 |
Resolving issue as `moved`. This issue tracker is no longer used. Further discussion of this issue may take place in the current CMake Issues page linked in the banner at the top of this page. |
| Notes |
| Issue History | |||
| Date Modified | Username | Field | Change |
| 2009-03-18 10:19 | Denis Scherbakov | New Issue | |
| 2009-03-18 10:19 | Denis Scherbakov | File Added: CMakeLists.txt | |
| 2009-03-18 10:47 | Denis Scherbakov | Note Added: 0015722 | |
| 2009-03-18 10:55 | Denis Scherbakov | Note Added: 0015723 | |
| 2009-03-22 22:04 | Bill Hoffman | Note Added: 0015753 | |
| 2009-03-22 22:04 | Bill Hoffman | Status | new => assigned |
| 2009-03-22 22:04 | Bill Hoffman | Assigned To | => Bill Hoffman |
| 2009-03-23 05:10 | Denis Scherbakov | File Added: math.h | |
| 2009-03-23 05:11 | Denis Scherbakov | Note Added: 0015756 | |
| 2009-04-27 13:02 | Denis Scherbakov | Note Added: 0016195 | |
| 2010-01-22 18:48 | Mateusz Loskot | Note Added: 0019280 | |
| 2016-06-10 14:27 | Kitware Robot | Note Added: 0041517 | |
| 2016-06-10 14:27 | Kitware Robot | Status | assigned => resolved |
| 2016-06-10 14:27 | Kitware Robot | Resolution | open => moved |
| 2016-06-10 14:30 | Kitware Robot | Status | resolved => closed |
| Issue History |
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