Configure tests might be compiled twice.
----------------------------------------
Key: STDCXX-737
URL: https://issues.apache.org/jira/browse/STDCXX-737
Project: C++ Standard Library
Issue Type: Bug
Components: Configuration
Affects Versions: 4.2.0, 4.1.4, 4.1.3, 4.1.2
Environment: unix
Reporter: Farid Zaripov
>From
>http://www.nabble.com/forum/Permalink.jtp?root=15579207&post=15593021&page=y :
I made this change in GNUmakefile because the
EXTERN_FUNCTION_TEMPLATE.cpp
config test has compiled twice on my gcc/Linux:
1) first it was not linked with extern_function_template_imp.o and due
to this
the macro _RWSTD_NO_EXTERN_FUNCTION_TEMPLATE is defined in config.h
config.log:
---------
...
gcc -D_RWSTDDEBUG -pthread -I. -pedantic -nostdinc++ -g -W -Wall
-Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long
-Wcast-align -c
/usr/src/trunk/etc/config/src/extern_function_template_imp.cpp -o
extern_function_template_imp.o
gcc -D_RWSTDDEBUG -pthread -I. -pedantic -nostdinc++ -g -W -Wall
-Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long
-Wcast-align -c
/usr/src/trunk/etc/config/src/EXTERN_FUNCTION_TEMPLATE.cpp -o
EXTERN_FUNCTION_TEMPLATE.o
gcc EXTERN_FUNCTION_TEMPLATE.o -pthread -lm -lsupc++ -o
EXTERN_FUNCTION_TEMPLATE
EXTERN_FUNCTION_TEMPLATE.o(.text+0x26): In function `main':
/usr/src/trunk/etc/config/src/EXTERN_FUNCTION_TEMPLATE.cpp:47: undefined
reference to `S<int> foobar<int>(S<int>)'
collect2: ld returned 1 exit status
...
---------
config.h:
---------
...
// #define _RWSTD_NO_extern_function_template_imp
#define _RWSTD_NO_EXTERN_FUNCTION_TEMPLATE
...
---------
2) second it was linked with extern_function_template_imp.o and the
config.h contains the second entry, where
_RWSTD_NO_EXTERN_FUNCTION_TEMPLATE define is commented
config.log:
---------
...gcc -D_RWSTDDEBUG -pthread -I. -pedantic -nostdinc++ -g -W -Wall
-Wcast-qual -Winline -Wshadow -Wwrite-strings -Wno-long-long
-Wcast-align -c
/usr/src/trunk/etc/config/src/EXTERN_FUNCTION_TEMPLATE.cpp -o
EXTERN_FUNCTION_TEMPLATE.o
gcc EXTERN_FUNCTION_TEMPLATE.o -pthread extern_function_template_imp.o
-lm -lsupc++ -o EXTERN_FUNCTION_TEMPLATE
./EXTERN_FUNCTION_TEMPLATE
...
---------
config.h:
---------
...
// #define _RWSTD_NO_EXTERN_FUNCTION_TEMPLATE
...
---------
As a result the _RWSTD_NO_EXTERN_FUNCTION_TEMPLATE macro is defined
while gcc supports the extern function templates.
The first compilation is come from "%.o: %.cpp" rule, and the second -
from "config:" rule.
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