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Enable more compiler warnings #1578

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MarcelRaad commented Jun 16, 2017

  • enable -Wvla also for clang; it was previously only enabled for GCC
  • enable -W also for mingw32-make based build
  • enable -Wdouble-promotion for both GCC and clang (typically warns when mixing float and double by accident)
  • enable -Wmissing-variable-declarations for clang (typically warns when forgetting to declare variables static)
  • enable -Wcomma for clang (see b875250 for a typical case)

All of these are fixed and trivial to fix. Tested with all possible combinations of

  • clang 3.5 to 5.0, GCC 5 to 7
  • native Ubuntu, Cygwin64 on Windows, MinGW on Windows (MSYS), MinGW-w64 on Windows (MSYS2 and native), MinGW-w64 on Ubuntu
  • 32 bit and 64 bit targets
  • OpenSSL, GnuTLS, NSS, CyaSSL/WolfSSL, mbedTLS, PolarSSL, and WinSSL backends

I could also push a subset if anyone feels that some of these warnings make no sense.

MarcelRaad added 5 commits Jun 14, 2017
Previously, that warning was only implicitly active in C90 mode.
Enable it unconditionally as already done for GCC.
Enable -Wdouble-promotion for both GCC and clang. It warns on implicit
promotion from float to double.
It usually warns when forgetting to declare TU-local variables static.
It usually warns when using commas instead of semicolons or other
operators by accident.
The configure-based build also has this in addition to -Wall.
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coveralls commented Jun 16, 2017

Coverage Status

Coverage increased (+0.004%) to 73.402% when pulling b56caa8 on MarcelRaad:enable_warnings into e9422bc on curl:master.

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bagder approved these changes Jun 16, 2017
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bagder left a comment

I'm 👍 on more warning options!

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MarcelRaad commented Jun 16, 2017

Thanks!

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MarcelRaad commented Jun 16, 2017

Strange, why didn't the "Closes #1578" work, can only one commit have that?
Merged in ce2cc56.

@MarcelRaad MarcelRaad closed this Jun 16, 2017
@MarcelRaad MarcelRaad deleted the MarcelRaad:enable_warnings branch Jun 16, 2017
MarcelRaad added a commit to MarcelRaad/curl that referenced this pull request Jun 16, 2017
Previously, that warning was only implicitly active in C90 mode.
Enable it unconditionally as already done for GCC.

Closes curl#1578
MarcelRaad added a commit to MarcelRaad/curl that referenced this pull request Jun 16, 2017
Enable -Wdouble-promotion for both GCC and clang. It warns on implicit
promotion from float to double.

Closes curl#1578
MarcelRaad added a commit to MarcelRaad/curl that referenced this pull request Jun 16, 2017
It usually warns when forgetting to declare TU-local variables static.

Closes curl#1578
MarcelRaad added a commit to MarcelRaad/curl that referenced this pull request Jun 16, 2017
It usually warns when using commas instead of semicolons or other
operators by accident.

Closes curl#1578
MarcelRaad added a commit to MarcelRaad/curl that referenced this pull request Jun 16, 2017
The configure-based build also has this in addition to -Wall.

Closes curl#1578
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jay commented Jun 16, 2017

Strange, why didn't the "Closes #1578" work, can only one commit have that?

It seems odd that it would be limited in that way. Probably there was some lag and you just beat it to the punch.

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