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Nim string definition conflicts with other C/C++ instances #10907

genotrance opened this issue Mar 26, 2019 · 0 comments


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commented Mar 26, 2019

The Oracle Instant Client code has the following definition in oratypes.h.

typedef  oratext *string;

This conflicts with nimbase.h:

typedef struct TStringDesc* string;

Ideally the Nim implementation should use a unique name so that it doesn't conflict with any existing C/C++ libs that are wrapped.

import oci

let username = "...".cstring
let password = "...".cstring
let server   = "...".cstring

let ptrUsername = cast[ptr OraText](username)
let ptrPassword = cast[ptr OraText](password)
let ptrServer   = cast[ptr OraText](server)

  xtramemsz = 0.cuint
  nimOCIEnv = 0.cuint
  nimOCIError: ptr OCIError
  PNimOCIEnv: ptr OCIEnv
  PPNimOCIEnv = PNimOCIEnv.addr
  addrXtramemsz: ptr = xtramemsz.addr
  usrmempp: pointer
  Pusrmempp = usrmempp.addr
  nimOCI_DEFAULT = cast[ub4](OCI_DEFAULT)

# proc OCIEnvInit*(envp: ptr ptr OCIEnv; mode: ub4; xtramem_sz: cuint; usrmempp: ptr pointer): sword {.importc, header: headerociap.}
var environment = OCIEnvInit(PPNimOCIEnv, nimOCI_DEFAULT, xtramemsz, Pusrmempp)

# ======
# In file included from C:/code/instantclient_18_5/sdk/include/ociap.h:802:0,
#                  from C:\Users\jaredfields\nimcache\nim_Oracle_r\nim_Oracle.c:10:
# C:/code/instantclient_18_5/sdk/include/oratypes.h:311:19: error: conflicting types for 'string'
#  typedef  oratext *string;
#                    ^~~~~~
# In file included from C:\Users\jaredfields\nimcache\nim_Oracle_r\nim_Oracle.c:9:0:
# C:\nim\lib/nimbase.h:397:29: note: previous declaration of 'string' was here
#  typedef struct TStringDesc* string;
#                              ^~~~~~

genotrance added a commit to genotrance/Nim that referenced this issue Mar 26, 2019

narimiran added a commit that referenced this issue May 7, 2019

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