URL:
<http://savannah.gnu.org/bugs/?46304>
Summary: HAVE_CASE_INSENSITIVE_FS breaks default rules since
3.99.90
Project: make
Submitted by: None
Submitted on: Mon 26 Oct 2015 11:05:36 PM UTC
Severity: 3 - Normal
Item Group: Bug
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: 4.0
Operating System: MS Windows
Fixed Release: None
Triage Status: None
_______________________________________________________
Details:
Hello,
Somewhere between 3.81.90 and 3.99.90 the built-in rule for .c files got
changed to call `g++` instead of `cc`, when using ./configure option
`--enable-case-insensitive-file-system` or the corresponding build-time macro
`HAVE_CASE_INSENSITIVE_FS`. This is the recommended way to build under
Windows, as per README.w32. The problem is still present in latest version 4.1
and even in the Git master repository.
The problem is likely caused by internal confusion about .C and .c extensions
differing only in casing, where the former implies C++, while the latter is
expected to imply plain C - even on Windows - but it implies C++ instead.
The end result is that certain plain C sources cannot be compiled, as it is
being fed to the C++ compiler, which is much more picky about the language and
might also generate incompatible object files.
Reproducible using a zero-length `test.c` file and following `Makefile` in the
same directory:
```
test:
```
Running `mingw-make.exe` results in:
3.81.90 (ok):
```
cc test.c -o test
```
3.99.90 (not OK):
```
g++ test.c -o test
```
Also apparent by listing built-in rules using -p option:
`mingw32-make.exe -p`
3.81.90 (ok):
```
%.o: %.c
# recipe to execute (built-in):
$(COMPILE.c) $(OUTPUT_OPTION) $<
```
3.99.90 (not OK):
```
%.o: %.c
# recipe to execute (built-in):
$(COMPILE.C) $(OUTPUT_OPTION) $<
```
Example Windows binary that
- exhibit the problem (= built _with_ the HAVE_CASE_INSENSITIVE_FS option):
https://www.mirrorservice.org/sites/dl.sourceforge.net/pub/sourceforge/m/mi/mingw-w64/Toolchains%20targetting%20Win64/Personal%20Builds/mingw-builds/5.1.0/threads-win32/sjlj/x86_64-5.1.0-release-win32-sjlj-rt_v4-rev0.7z
- is working correctly (= built _without_ the HAVE_CASE_INSENSITIVE_FS
option):
https://www.mirrorservice.org/sites/dl.sourceforge.net/pub/sourceforge/m/mi/mingw-w64-dgn/mingw-w64/mingw-w64-bin-x86_64-20150611.7z
Additional information on this URL:
https://github.com/niXman/mingw-builds/issues/413
-Viktor
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